I initially made the same mistake as you. The site that you
mention is an eclipse update site and you should use the
address to configure a new site in the software manager.
Once you've done this, you can install the parser generators
that you need.

I initially made the same mistake as you. The site that you
mention is an eclipse update site and you should use the
address to configure a new site in the software manager.
Once you've done this, you can install the parser generators
that you need.